There is a thread here which contains discussions of various Canon and Sigma wide angle lenses... these may be included but you may need to burrow through the postings to find this out.
http://forums.dpreview.com/forums/read.asp?forum=1032&message=6990953
On 28 Apr 2004, at 10:31, Justin Scobie wrote:
Hi
I have just purchased a Canon 1Ds camera and looking to test the Canon 16 - 35 F2.8 against the Sigma 17 - 35 F2.8. Can anyone suggest any compartive tests
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